chore: fix hurl syntax error

Correction for a486ee0 commit.

Relate to #23

Author: php-coder

tests/crud.hurl

@@ -49,7 +49,7 @@ jsonpath "$[0].name_ru" == null
 jsonpath "$[0].slug"    == "sport"
 jsonpath "$[0].hidden"  == true
 
-GET {{ SERVER_URL }} /v1/categories/search?hidden=true
+GET {{ SERVER_URL }}/v1/categories/search?hidden=true
 HTTP 200
 [Asserts]
 jsonpath "$" count     == 1
@@ -78,7 +78,7 @@ jsonpath "$.name_ru"  == "Фауна"
 jsonpath "$.slug"     == "fauna"
 jsonpath "$.hidden"   == false
 
-GET {{ SERVER_URL }} /v1/categories/search?hidden=false
+GET {{ SERVER_URL }}/v1/categories/search?hidden=false
 HTTP 200
 [Asserts]
 jsonpath "$" count     == 1